Lubricating grease heating device of wind driven generator and control method of lubricating grease heating device

Abstract

The embodiment of the invention discloses a lubricating grease heating device of a wind driven generator and a control method of the lubricating grease heating device, lubricating grease is located in a shell, and the lubricating grease heating device of the wind driven generator comprises a mounting disc, a heating coil, a circuit board, a temperature sensor and a control device. The installation disc is connected with the outer wall of the shell, the heating coil is connected with the installation disc, a heating circuit is arranged on the circuit board and connected with the heating coil, the heating coil is used for generating a variable magnetic field to enable the shell to generate an eddy current effect, and the temperature sensor is located in the shell and used for obtaining the temperature value of lubricating grease. And the control device is connected with the temperature sensor and is used for controlling the on-off of the heating circuit according to the temperature value. The control device controls the on-off of the heating circuit according to the temperature value and further controls the heating state of the lubricating grease, so that the temperature of the lubricating grease is kept within an ideal range, the lubricating effect of the lubricating grease is guaranteed, and the lubricating grease is prevented from being solidified and hardened due to low temperature.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of wind power generation devices, and in particular to a grease heating device for a wind power generator and a control method for the grease heating device. Background Art

[0002] There are a large number of rotating parts in wind turbines, such as yaw bearings, pitch bearings, main shaft bearings, and generator bearings, so centralized lubrication systems are widely used in wind turbines. The lubricating medium in the centralized lubrication system includes grease, which is a semi-solid colloid and an ideal fluid lubrication medium, but the viscosity of grease is greatly affected by temperature. Since wind turbines are generally located in high-altitude, high-altitude areas with good wind resources, the ambient temperature usually reaches around minus 30°C in low temperature seasons. Under low temperature conditions, the viscosity of grease is high and the flow performance is poor. Therefore, the filling process faces the problems of large transmission resistance and severe grease hardening.

[0003] Since the centralized lubrication system operates intermittently, the grease will remain stationary for several hours under low temperature conditions, and the grease will easily transform from semi-solid to solid. Long-term poor lubrication of the transmission system is often accompanied by damage to major components of the unit, causing serious economic losses. Therefore, reducing the blockage of the centralized lubrication system has become a problem that needs to be solved in the wind power generation industry. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, a first aspect of the present invention provides a wind turbine grease heating device.

[0006] A second aspect of the present invention provides a control method for a grease heating device.

[0007] In view of this, according to the first aspect of the technical solution of the present application, a wind turbine grease heating device is proposed, wherein the grease is located in a shell, and the wind turbine grease heating device comprises: a mounting plate, a heating coil, a circuit board, a temperature sensor, and a control device. The mounting plate is connected to the outer wall of the shell, the heating coil is connected to the mounting plate, a heating circuit is provided on the circuit board, the heating circuit is connected to the heating coil, the heating coil is used to generate a transformed magnetic field, so that the shell generates an eddy current effect, the temperature sensor is located in the shell, the temperature sensor is used to obtain the temperature value of the grease, the control device is connected to the temperature sensor, and the control device is used to control the on and off of the heating circuit according to the temperature value.

[0008] In some technical solutions provided in the present application, optionally, the heating circuit includes: a resonant capacitor, an insulated gate bipolar transistor and a rectifier bridge. The resonant capacitor is connected in parallel with the heating coil, the collector of the insulated gate bipolar transistor is connected to the first end of the heating coil, the two DC ends of the rectifier bridge are respectively connected to the second end of the heating coil and the emitter of the insulated gate bipolar transistor, and the two AC ends of the rectifier bridge are respectively connected to the power supply.

[0009] In some technical solutions provided in the present application, optionally, the heating circuit also includes: a choke coil and a smoothing capacitor, the two ends of the choke coil are respectively connected to the DC end of the rectifier bridge and the second end of the heating coil, and the two ends of the smoothing capacitor are respectively connected to the emitter of the insulated gate bipolar transistor and the second end of the heating coil.

[0010] In some technical solutions provided in the present application, optionally, the wind turbine grease heating device also includes: a shell and a connector, the shell accommodates the mounting plate and the circuit board, the connector is used to connect the shell and the housing, and the connector is made of magnetic material.

[0011] In some technical solutions provided in the present application, optionally, the wind turbine grease heating device also includes: a connecting plate, the connecting plate is arranged on the top wall of the outer shell, the connecting plate is connected to the connecting piece, and the connecting plate is made of microcrystalline glass material.

[0012] In some technical solutions provided in the present application, optionally, the control device also includes: an acquisition module, a power supply module and a sending module, the acquisition module is connected to the temperature sensor, the power supply module is connected to the power supply of the circuit board, and the sending module is used to send the temperature value to the fan master control analog module.

[0013] In some technical solutions provided in the present application, optionally, the control device also includes: an alarm module and / or a communication module, the alarm module is used to send an alarm signal, the communication module is connected to the fan master control communication module, and the communication module uses a 485 communication channel.

[0014] In some technical solutions provided in the present application, optionally, the control device also includes: a backup module, and the backup module is connected to the temperature sensor when in use.

[0015] The second technical solution of the present application provides a control method for a grease heating device, which is used for a wind turbine grease heating device provided by any one of the first technical solutions above, and the control method for the grease heating device includes: obtaining the temperature value of the grease through a temperature sensor; comparing the temperature value with the heating start temperature value, and controlling the heating circuit based on the comparison result; comparing the temperature value with the temperature threshold, and controlling the heating circuit based on the comparison result; wherein, when the temperature value is less than or equal to the heating start temperature value, the control device controls the heating circuit to be connected, and when the temperature value is greater than or equal to the temperature threshold, the control device controls the heating circuit to be disconnected.

[0016] In some technical solutions provided in the present application, optionally, after the step of the control device controlling the heating circuit to be connected, it also includes: when the temperature value is less than or equal to the alarm temperature value, the control device sends an alarm signal.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] The heating coil heats the shell through the eddy current effect, shortening the heating time of the grease in the shell, improving the heating efficiency, avoiding direct contact between the heating coil and the grease, and reducing the contamination of the grease. The control device controls the on-off of the heating circuit according to the temperature value, and then controls the heating state of the grease, so that the temperature of the grease is kept within the ideal range, ensuring the viscosity and fluidity of the grease, and then ensuring the lubricating effect of the grease, avoiding the solidification and hardening of the grease due to low temperature, reducing the blockage of the lubrication system, and ensuring the lubrication effect of the transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0020] Figure 1 A schematic structural diagram of a wind turbine grease heating device according to an embodiment of the present application;

[0021] Figure 2 A schematic diagram of a heating circuit according to an embodiment of the present application;

[0022] Figure 3 A schematic diagram of the structure of a control device according to an embodiment of the present application;

[0023] Figure 4A schematic flow chart of a control method for a grease heating device according to an embodiment of the present application.

[0024] in, Figures 1 to 4 The corresponding relationship between the reference numerals and the component names is as follows:

[0025] 10 wind turbine grease heating device, 100 mounting plate, 200 heating coil, 300 circuit board, 310 resonant capacitor, 320 insulated gate bipolar transistor, 330 rectifier bridge, 340 power supply, 350 choke coil, 360 smoothing capacitor, 400 temperature sensor, 500 control device, 510 acquisition module, 520 power supply module, 530 sending module, 540 alarm module, 550 communication module, 560 spare module, 600 housing, 610 connecting plate, 700 connecting piece, 800 power interface, 21 wind turbine master control communication module, 22 wind turbine master control analog module. DETAILED DESCRIPTION

[0026] In order to better understand the above-mentioned technical scheme, the technical scheme of the embodiments of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical scheme of the embodiments of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments may be combined with each other.

[0027] The first embodiment of the present application provides a wind turbine generator grease heating device 10, such as Figure 1 and Figure 2 As shown, the grease is located in the shell, and the wind turbine grease heating device 10 includes: a mounting plate 100, a heating coil 200, a circuit board 300, a temperature sensor 400 and a control device 500. The mounting plate 100 is connected to the outer wall of the shell, the heating coil 200 is connected to the mounting plate 100, a heating circuit is provided on the circuit board 300, the heating circuit is connected to the heating coil 200, the heating coil 200 is used to generate a transformed magnetic field to generate an eddy current effect on the shell, the temperature sensor 400 is located in the shell, the temperature sensor 400 is used to obtain the temperature value of the grease, the control device 500 is connected to the temperature sensor 400, and the control device 500 is used to control the on and off of the heating circuit according to the temperature value.

[0028] In this embodiment, the housing 600 is made of metal material, and the mounting plate 100 is located outside the housing. For example, the housing can be a dispenser. The mounting plate 100 provides structural support for the heating coil 200. The heating circuit on the circuit board 300 is connected to the heating coil 200. When the heating circuit is connected, the heating coil 200 can generate a transformed magnetic field. Due to the effect of electromagnetic induction, an induced current is generated inside the housing, thereby forming an eddy current effect on the housing, heating the housing, and then increasing the temperature of the grease inside the housing.

[0029] The heating coil 200 heats the shell through the eddy current effect, which shortens the heating time of the grease in the shell, improves the heating efficiency, and avoids direct contact between the heating coil 200 and the grease, reducing the contamination of the grease.

[0030] The temperature sensor 400 in the shell extends into the grease to obtain the temperature value of the grease. The temperature sensor 400 sends the temperature value to the control device 500. The control device 500 compares the temperature value with the heating start temperature value and the temperature threshold in turn, and controls the on and off of the heating circuit based on the above two comparison results.

[0031] Specifically, the temperature threshold is greater than the heating start temperature value. When the temperature value is less than or equal to the heating start temperature value, it means that the temperature of the grease is too low and it is easy to solidify. The grease needs to be heated. At this time, the heating circuit is connected, so that the heating coil 200 heats the grease in the housing through the eddy current effect. The temperature of the grease continues to rise during the heating process. When the temperature value is greater than or equal to the temperature threshold, the grease is already in the appropriate temperature range, the heating circuit is disconnected, and the heating of the grease is stopped.

[0032] The control device 500 controls the on and off of the heating circuit according to the temperature value, and further controls the heating state of the grease, so that the temperature of the grease is maintained within an ideal range, thereby ensuring the viscosity and fluidity of the grease, and further ensuring the lubricating effect of the grease, avoiding the solidification and hardening of the grease due to low temperature, reducing the blockage of the lubrication system, and ensuring the lubrication effect of the transmission system.

[0033] Exemplarily, the temperature sensor 400 uses a platinum thermal resistor, and the resistance value of the resistor has a matching linear relationship with the temperature of the grease.

[0034] In some embodiments provided in this application, Figure 2As shown, optionally, the heating circuit includes: a resonant capacitor 310, an insulated gate bipolar transistor 320 and a rectifier bridge 330. The resonant capacitor 310 is connected in parallel with the heating coil 200, the collector of the insulated gate bipolar transistor 320 is connected to the first end of the heating coil 200, the two DC ends of the rectifier bridge 330 are respectively connected to the second end of the heating coil 200 and the emitter of the insulated gate bipolar transistor 320, and the two AC ends of the rectifier bridge 330 are respectively connected to the power supply 340.

[0035] In this embodiment, the DC end of the rectifier bridge 330 is connected to the heating coil 200 and the insulated gate bipolar transistor 320, and the AC end is connected to the power supply 340 to convert the power frequency current of the power supply 340 into a DC current. Exemplarily, the power supply 340 is an AC 24V to prevent the grease temperature from rising too quickly.

[0036] The resonant capacitor 310 is connected in parallel at both ends of the heating coil 200, and the insulated gate bipolar transistor 320 is provided with a collector, an emitter and a gate. The collector is connected to the heating coil 200, and the gate is connected to the control circuit. The control circuit can emit a rectangular pulse drive. When the insulated gate bipolar transistor 320 is in the on state, the current flowing through the heating coil 200 increases rapidly. When the insulated gate bipolar transistor 320 is in the off state, the heating coil 200 and the resonant capacitor 310 resonate in series, and the insulated gate bipolar transistor 320 generates a high-voltage pulse to the ground. When the pulse drops to zero, the driving pulse acts on the insulated gate bipolar transistor 320 again to turn it on. The above process is repeated, and finally an alternating magnetic field is generated on the heating coil 200, thereby forming an eddy current effect on the shell to heat the grease in the shell.

[0037] In some embodiments provided in this application, Figure 2 As shown, optionally, the heating circuit also includes: a choke coil 350 and a smoothing capacitor 360, wherein the two ends of the choke coil 350 are respectively connected to the DC end of the rectifier bridge 330 and the second end of the heating coil 200, and the two ends of the smoothing capacitor 360 are respectively connected to the emitter of the insulated gate bipolar transistor 320 and the second end of the heating coil 200.

[0038] In this embodiment, the DC end of the rectifier bridge 330 is connected to the heating coil 200 through the choke coil 350. The choke coil 350 is used to control the current in the circuit to avoid excessive or insufficient current, so as to make the circuit work more stably.

[0039] Two ends of the smoothing capacitor 360 are respectively connected to the emitter of the insulated gate bipolar transistor 320 and the second end of the heating coil 200. The smoothing capacitor 360 can smooth the DC voltage, stabilize the DC voltage of the circuit and reduce ripples.

[0040] In some embodiments provided in this application, Figure 1As shown, optionally, the wind turbine grease heating device 10 further includes: a housing 600 and a connector 700, the housing 600 accommodates the mounting plate 100 and the circuit board 300, the connector 700 is used to connect the housing 600 and the shell, and the connector 700 is made of magnetic material.

[0041] In this embodiment, the mounting plate 100 and the circuit board 300 are located in the outer shell 600, and the outer shell 600 is detachably connected to the shell through a connector 700. The connector 700 has a magnetic attraction, so that the outer shell 600 can be adsorbed on the outer wall of the shell, thereby improving the convenience of disassembly and assembly of the outer shell 600.

[0042] Exemplarily, the connecting member 700 may be a permanent magnet or an electromagnet.

[0043] In some embodiments provided in this application, Figure 1 As shown, optionally, the wind turbine grease heating device 10 further includes: a connecting plate 610, the connecting plate 610 is arranged on the top wall of the outer shell 600, the connecting plate 610 is connected to the connecting member 700, and the connecting plate 610 is made of microcrystalline glass material.

[0044] In this embodiment, the connecting plate 610 can be configured as at least part of the top wall of the housing 600, and the housing 600 is connected to the connecting member 700 through the connecting plate 610. The connecting plate 610 is made of microcrystalline glass material, so that the connecting plate 610 has good anti-magnetic properties and heat conduction efficiency, and avoids the connecting plate 610 from affecting the eddy current effect of the heating coil 200 on the housing, thereby ensuring the heating effect of the housing. In addition, the microcrystalline glass material has high hardness and wear resistance, which improves the connection stability and durability of the housing 600.

[0045] Exemplarily, a groove is provided on the connecting plate 610, and the connecting member 700 is provided in the groove, which increases the contact area between the connecting member 700 and the housing 600, increases the connection strength of the connecting member 700, and reduces the thickness of the wind turbine grease heating device 10. The housing 600 is made of microcrystalline glass material.

[0046] In some embodiments provided in this application, Figure 3 As shown, optionally, the control device 500 also includes: an acquisition module 510, a power supply module 520 and a sending module 530, the acquisition module 510 is connected to the temperature sensor 400, the power supply module 520 is connected to the power supply 340 of the circuit board 300, and the sending module 530 is used to send the temperature value to the fan master control analog module 22.

[0047] In this embodiment, the control device 500 uses a single chip microcomputer, and controls the opening and closing of contacts through temperature detection, thereby controlling the heating circuit.

[0048] The acquisition module 510 can receive the temperature value detected by the temperature sensor 400. The wind turbine generator set also includes a fan master control device. The sending module 530 sends the temperature value of the 4mA to 20mA signal to the fan master control analog module 22, so that the fan master control device can perform real-time detection of the grease temperature.

[0049] The power supply 340 of the circuit board 300 can be controlled by the power supply module 520. When the power supply module 520 is turned on, the power supply 340 of the circuit board 300 is in a power supply state, and the heating coil 200 can heat the grease through the housing. When the power supply module 520 is disconnected, the power supply 340 of the circuit board 300 is in a power-off state, and the heating wire stops heating the grease. The power supply state of the heating circuit is controlled by the power supply module 520, and the heating state of the grease is controlled.

[0050] In some embodiments provided in this application, Figure 3 As shown, optionally, the control device 500 further includes: an alarm module 540 and / or a communication module 550, the alarm module 540 is used to send an alarm signal, the communication module 550 is connected to the fan master control communication module 21, and the communication module 550 uses a 485 communication channel.

[0051] In this embodiment, when the heating circuit is turned on, if the temperature of the grease does not rise to a reasonable temperature, it can be determined that the heating circuit or the heating coil 200 is faulty, and an alarm signal is sent through the alarm module 540 to facilitate timely inspection and maintenance by the operator.

[0052] The communication module 550 is connected to the fan main control communication module 21 to realize the automatic control of the grease heating system. The communication module 550 using the 485 communication channel has the characteristics of long transmission distance, strong anti-interference ability, support for multiple nodes, and simple wiring.

[0053] In some embodiments provided in this application, Figure 3 As shown, optionally, the control device 500 further includes: a backup module 560, and the backup module 560 is connected to the temperature sensor 400 when in use.

[0054] In this embodiment, the backup module 560 is redundantly configured and is connected to the temperature sensor 400 when in use. It can replace the acquisition module 510 to receive the temperature value detected by the temperature sensor 400, ensuring that the control device 500 can operate normally when the acquisition module 510 is repaired or replaced.

[0055] Exemplarily, the control device 500 may include 20 contacts. Contact 1 and contact 2 are used to connect the power supply 340 of the control device 500. The backup module 560 also includes a backup normally open module and a backup normally closed module, contact 7 and contact 8 are a group of backup normally open contacts, and contact 9 and contact 10 are a group of backup normally closed contacts.

[0056] In a second aspect of the present application, an embodiment provides a control method for a grease heating device, such as Figure 4 As shown, the control method of the grease heating device is used for the wind turbine grease heating device provided by any one of the first aspect embodiments above, and the control method of the grease heating device comprises:

[0057] Step 101, obtaining the temperature value of the grease through a temperature sensor;

[0058] Step 102, comparing the temperature value with the heating start temperature value, and controlling the heating circuit based on the comparison result;

[0059] Step 103, comparing the temperature value with a temperature threshold, and controlling the heating circuit based on the comparison result;

[0060] When the temperature value is less than or equal to the heating start temperature value, the control device controls the heating circuit to be connected; when the temperature value is greater than or equal to the temperature threshold, the control device controls the heating circuit to be disconnected.

[0061] In this embodiment, the temperature sensor in the shell extends into the grease to obtain the temperature value of the grease. The temperature sensor sends the temperature value to the control device. The control device compares the temperature value with the heating start temperature value and the temperature threshold in turn, and controls the on and off of the heating circuit based on the above two comparison results.

[0062] Specifically, the temperature threshold is greater than the heating start temperature value. When the temperature value is less than or equal to the heating start temperature value, it means that the temperature of the grease is too low and it is easy to solidify. The grease needs to be heated. At this time, the heating circuit is connected, so that the heating coil heats the grease in the shell through the eddy current effect. The temperature of the grease continues to rise during the heating process. When the temperature value is greater than or equal to the temperature threshold, the grease is already in the appropriate temperature range, the heating circuit is disconnected, and the heating of the grease is stopped.

[0063] The control device controls the on and off of the heating circuit according to the temperature value, and then controls the heating state of the grease, so that the temperature of the grease is maintained within the ideal range, ensuring the viscosity and fluidity of the grease, and then ensuring the lubricating effect of the grease, avoiding the solidification and hardening of the grease due to low temperature, reducing the blockage of the lubrication system, and ensuring the lubrication effect of the transmission system.

[0064] In some embodiments provided in the present application, optionally, after the step of the control device controlling the heating circuit to be connected, the method further includes: when the temperature value is less than or equal to the alarm temperature value, the control device sends an alarm signal.

[0065] In this embodiment, after the heating circuit is connected, if the temperature value is less than or equal to the alarm temperature value, it means that the grease is not effectively heated, and the heating circuit or heating coil may be faulty. The control device sends an alarm signal to facilitate the operator to check and repair in time.

[0066] Exemplarily, after the step of controlling the heating circuit to be connected by the control device, the method further includes: when the heating time is greater than or equal to the threshold time, the control device sends an alarm signal. In this case, the grease temperature has not reached the threshold for a long time, and the operator needs to be reminded to check.

[0067] In a specific embodiment, the wind turbine grease heating device 10 is composed of a heater and a temperature controller (i.e., a control device 500), and the heater includes: a housing 600, a connecting plate 610, a connector 700, a heating plate, a heating plate fixing screw, a power interface 800, and a circuit board 300. The housing 600 and the connecting plate 610 are made of microcrystalline glass material, and the two cooperate to play a role of sealing and isolation. The connector 700 adopts a permanent magnet and is embedded in the connecting plate 610. The connector 700 fixes the heater on the centralized lubrication system distributor through magnetic force, so as to realize convenient installation and disassembly of the heater. The heating plate is composed of a heating coil 200 and a mounting plate 100, and the heating plate is installed inside the housing 600 by fixing screws. The power interface 800 is the power supply interface of the heater, which is connected through a standard R-shaped plug. A rectifier bridge 330, a choke coil 350, a heating coil 200, a smoothing capacitor 360, a resonant capacitor 310 and a gate control tube are provided on the circuit board 300. Through this circuit, the heating coil 200 generates a high-frequency alternating magnetic field, which produces an eddy current effect to heat the grease inside the distributor.

[0068] The temperature controller uses a single-chip microcomputer to control the opening and closing of contacts through temperature detection to achieve heater control. The temperature controller is designed with a total of 20 contacts, of which contact 1 and contact 2 are a group of the power supply of the temperature controller. Contact 3 and contact 4 are a group of temperature-controlled contacts, through which the heater is powered. Contact 7 and contact 8 are a group of spare normally open contacts, and contact 9 and contact 10 are a group of spare normally closed contacts. Contact 11 and contact 12 are a group of 4mA to 20mA signals, which are connected to the fan main control analog module 22 and can be defined as the distributor grease temperature to achieve real-time temperature detection. Contact 13 and contact 14 are a group of 485 communication channels, which are connected to the fan 485 communication module 550 to achieve automatic control of the grease heating system. Contact 18, contact 19 and contact 20 are a group of temperature sensors 400, which are installed inside the distributor to detect the grease temperature in real time. Contact 15 , contact 16 , and contact 17 form a group of a backup temperature sensor 400 , which is redundant with contact 18 , contact 19 , and contact 20 .

[0069] The temperature controller function settings include automatic temperature control function and alarm output function. When the measured temperature is less than or equal to the heating start temperature value QD (adjustable), contact 3 and contact 4 are closed, and the heater is started. When the temperature rises to "heating start temperature value QD" + "temperature rise value WS", contact 3 and contact 4 are disconnected, and the heater stops running, thereby realizing the temperature automatic control function. After the heater starts heating, if the grease temperature continues to drop, when the temperature is lower than the alarm temperature value BJ (adjustable), contact 5 and contact 6 are closed, providing an alarm signal to the fan main control, thereby realizing the alarm output function.

[0070] The working process of the present invention is as follows: in a low temperature environment, the temperature controller detects the temperature of the grease in the distributor through the temperature sensor 400. When the heater start condition is reached, the heater adsorbed on the distributor is powered. The heater generates an eddy current effect through an internal oscillation circuit to heat the grease in the distributor. When the grease temperature in the distributor reaches the heater stop condition, the temperature controller disconnects the heater power supply 340. If the heater fails and the grease is not effectively heated, the temperature controller provides a low grease temperature alarm signal to the wind turbine generator set.

[0071] The beneficial effects of the present invention are: by controlling the temperature of the grease of the wind turbine generator set, its viscosity can be kept under ideal conditions, ensuring its fluidity, and avoiding the common phenomenon of blockage of the centralized lubrication system of the wind turbine generator set due to the extreme operating environment of the wind turbine generator set. On the one hand, the low-temperature performance requirements of the grease are reduced, reducing the maintenance cost of the wind turbine generator set; on the other hand, the failure frequency of the centralized lubrication system of the wind turbine generator set is reduced, providing a guarantee for the ideal full-film lubrication state of the rotating parts of the wind turbine generator set, greatly slowing down the wear and deterioration process of the rotating parts, and the service life of the main shaft bearing, yaw bearing, pitch bearing, etc. can be improved, thereby improving the equipment availability and the economic benefits of the wind power generation industry.

[0072] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0074] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0075] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wind turbine grease heating device, characterized in that: The lubricating grease is located in the housing, and the lubricating grease heating device for a wind turbine generator comprises: A mounting plate connected to the outer wall of the housing; A heating coil connected to the mounting plate; A circuit board, wherein a heating circuit is provided on the circuit board, wherein the heating circuit is connected to the heating coil, and the heating coil is used to generate a transformed magnetic field so as to generate an eddy current effect in the housing; A temperature sensor is located in the housing and is used to obtain a temperature value of the grease; A control device is connected to the temperature sensor, and is used to control the on and off of the heating circuit according to the temperature value.

2. The wind turbine generator grease heating device according to claim 1, characterized in that: The heating circuit comprises: A resonant capacitor connected in parallel with the heating coil; an insulated gate bipolar transistor, wherein the collector of the insulated gate bipolar transistor is connected to the first end of the heating coil; A rectifier bridge, wherein two DC ends of the rectifier bridge are respectively connected to the second end of the heating coil and the emitter of the insulated gate bipolar transistor, and two AC ends of the rectifier bridge are respectively connected to a power supply.

3. The wind turbine generator grease heating device according to claim 2, characterized in that: The heating circuit also includes: A choke coil, two ends of which are respectively connected to the DC end of the rectifier bridge and the second end of the heating coil; A smoothing capacitor, wherein two ends of the smoothing capacitor are respectively connected to the emitter of the insulated gate bipolar transistor and the second end of the heating coil.

4. The wind turbine generator grease heating device according to claim 1, characterized in that: Also includes: A housing for accommodating the mounting plate and the circuit board; A connecting piece is used to connect the shell and the casing, and the connecting piece is made of magnetic material.

5. The wind turbine generator grease heating device according to claim 4, characterized in that: Also includes: A connecting plate is arranged on the top wall of the shell, the connecting plate is connected to the connecting piece, and the connecting plate is made of microcrystalline glass material.

6. The grease heating device for a wind turbine generator according to any one of claims 1 to 5, characterized in that: The control device also includes: An acquisition module connected to the temperature sensor; A power supply module connected to a power supply of the circuit board; The sending module is used to send the temperature value to the fan main control analog module.

7. The grease heating device for a wind turbine generator according to any one of claims 1 to 5, characterized in that: The control device also includes: An alarm module, used to send an alarm signal; and / or The communication module is connected to the fan main control communication module, and the communication module adopts a 485 communication channel.

8. The grease heating device for a wind turbine generator according to any one of claims 1 to 5, characterized in that: The control device also includes: A standby module is connected to the temperature sensor when in use.

9. A control method for a grease heating device, characterized in that: For the grease heating device for a wind turbine generator as claimed in claims 1 to 8, the control method of the grease heating device comprises: Obtain the temperature value of the grease through a temperature sensor; comparing the temperature value with a heating start temperature value, and controlling the heating circuit based on the comparison result; comparing the temperature value with a temperature threshold, and controlling the heating circuit based on the comparison result; Wherein, when the temperature value is less than or equal to the heating start temperature value, the control device controls the heating circuit to be connected, and when the temperature value is greater than or equal to the temperature threshold, the control device controls the heating circuit to be disconnected.

10. The control method of the grease heating device according to claim 9, characterized in that: After the step of controlling the heating circuit to be connected by the control device, the method further includes: When the temperature value is less than or equal to the alarm temperature value, the control device sends an alarm signal.

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